CRYSTAL SIN YI CHEUNG
NPI 1861979833
Ophthalmology - Pediatric Ophthalmology and Strabismus Specialist in Boston, MA

NPI Status: Active since July 23, 2018

Contact Information

300 LONGWOOD AVE # FEGAN4
BOSTON, MA
ZIP 02115
Phone: (857) 472-2148

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  • Individual
  • Female
  • Ophthalmology
  • Pediatric Ophthalmology and Strabismus S...

About CRYSTAL SIN YI CHEUNG

This page provides the complete NPI Profile along with additional information for Crystal Sin Yi Cheung, a provider established in Boston, Massachusetts with a medical specialization in Ophthalmology, focusing in pediatric ophthalmology and strabismus specialist . The healthcare provider is registered in the NPI registry with number 1861979833 assigned on July 2018. The practitioner's primary taxonomy code is 207WX0110X with license number 277567 (MA). The provider is registered as an individual and her NPI record was last updated 7 years ago.

NPI
1861979833
Provider Name
CRYSTAL SIN YI CHEUNG
Gender
Female
Entity Type
Individual
Location Address
300 LONGWOOD AVE # FEGAN4 BOSTON, MA 02115
Location Phone
(857) 472-2148
Mailing Address
300 LONGWOOD AVE # FEGAN4 BOSTON, MA 02115
Mailing Phone
(617) 355-6401
Is Sole Proprietor?
Yes
Enumeration Date
07-23-2018
Last Update Date
02-01-2019
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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Ophthalmology Pediatric Ophthalmology and Strabismus Specialist

Taxonomy Code
207WX0110X
Type
Allopathic & Osteopathic Physicians
License No.
277567
License State
MA
Taxonomy Description
An ophthalmologist who specializes in pediatric ophthalmology and strabismus management. The subspecialty includes the medical and surgical management of eye disorders found in children. Some of the more common disorders include amblyopia, strabismus, refractive error, cataract and glaucoma. These disorders may be related to neurological and endocrinological diseases, trauma, or aging changes in the extraocular muscles requiring medical, optical and surgical management.

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1861979833, we treat the final digit (3) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 77. The final step is to find the difference between that total and the next multiple of ten (80 - 77 = 3).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
8
Unchanged
Pos 3
6
Doubled → 12 → 1 + 2
Pos 4
1
Unchanged
Pos 5
9
Doubled → 18 → 1 + 8
Pos 6
7
Unchanged
Pos 7
9
Doubled → 18 → 1 + 8
Pos 8
8
Unchanged
Pos 9
3
Doubled → 6
Check
3
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 6 → 12 → 3 9 → 18 → 9 9 → 18 → 9 3 → 6

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 8 + 1 + 2 + 1 + 1 + 8 + 7 + 1 + 8 + 8 + 6 + 24 = 77

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 77 is 80. The difference is the calculated check digit.

80 - 77 = 3
This NPI is valid
The calculated check digit is 3, which matches the last digit of 1861979833.

Other Providers at the Same Location


The following 4 providers are registered at the same or a nearby location.

Ophthalmology
300 LONGWOOD AVE # FEGAN4, DEPARTMENT OF OPHTHALMOLOGY CHILDREN'S HOSPITAL BOSTON
BOSTON, MA 02115
Student in an Organized Health Care Education/Training Program
300 LONGWOOD AVE # FEGAN4
BOSTON, MA 02115
Ophthalmology
300 LONGWOOD AVE # FEGAN4
BOSTON, MA 02115
Physician Assistant
300 LONGWOOD AVE # FEGAN4
BOSTON, MA 02115

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1861979833, enumerated as an "individual" on July 23, 2018.

The provider is located at 300 LONGWOOD AVE # FEGAN4 BOSTON, MA 02115 and the phone number is (857) 472-2148.

Ophthalmology with taxonomy code 207WX0110X and a focus in Pediatric Ophthalmology and Strabismus Specialist.